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First let me say that I am not the originator of this information. While at Don's maintenance day, one of our members was running around with a pair of needle-nose pliers adjusting the carb linkage tabs on various bikes. I am very sorry that I do not remember who this was, as I was concentrating very hard on syncing carbs and trying to keep from wilting in the heat! I did hear enough about it while he was working on a bike next to me that I remembered to check my own bikes when I got home. Glad I did. So let's get the real person identified here so he gets proper credit! Background: Our chokes are really just an enriching circuit that makes the bike run rich while the knob is pulled out. If you look under the tank at the choke knob, you can easily see the linkage and how it moves. In this first picture you can see that linkage on the left side of the bike, and just above the throttle spring you can see the tab the goes up to engage a brass plunger: [ATTACH]18696[/ATTACH] Here is a closeup of just that tab and plunger. You can clearly see how the metal tab is touching the inside shoulder of the plunger, forcing it all the way closed when the choke knob is pushed in. This is the correct position for the tab when the choke is closed: [ATTACH]18697[/ATTACH] As you begin to pull out the choke knob, those tabs move through that notch and begin to push against the head of the plungers to pull it out of the carb, activating the enriching circuit and making the engine run better when it is cold. The free play afforded by the notch probably just makes the bike less sensitive to slight position changes of the choke knob. Those pictures were from my 07 RSV, and all four choke tabs looked fine. Now here is a picture of what I found on 3 of the four carbs on my 05 RSV: [ATTACH]18695[/ATTACH] Besides the fact that it is dirty and nasty, notice how the tab is touching the head of the plunger while the choke is supposed to be off. At the very least this is not ensuring the plunger is all the way in, and worse, it is probably actually preventing it from closing. In that case, the result could be poor fuel mileage, rough idling in the heat, fouled plugs, etc. Those tabs are very soft metal, so if any of yours do not look right, just use a pair of needle-nose pliers to slightly bend the tab to rest up against the inside shoulder of the brass plunger when the choke knob is all the way in. If you have the Yamaha chrome carb covers on your bike, you will need to remove them to see all four tabs. I do not yet know how this fix has affected my fuel mileage, but I will report back after I have had a chance to run a tank or two through it on the open road. Goose
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